Diagnosis
The grouping type of installation &v1& has to bedetermined for the key date &v2&. This is not possible due to one ofthefollowing reasons:

• Installation &v1& does not exist on &v2&


• Installation &v1& is not a primary installation on &v2&

Procedure
Correct the installation group. You can only use installation &v1& as aprimary installation in the periods that contain a grouping type.